gary sobers
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Everything You Wanted to Kn
About Writing Async,Concurrent HTTP Apps i
Java
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Season o !ists and !e""ow ruitu"
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Close bosom-friend of the maturing sun
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Conspiring with him how to load and ble
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With fruit the vines that round the thatch-evrun;
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To bend with app"es the !oss#d cottage
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And ll all fruit with ripeness to the cor
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To swe"" the gourd, and p"u!p the ha%e
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With a sweet &erne"' to set budding !o
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And sti"" !ore, "ater (owers or the bee
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)nti" they thin& war! days wi"" never c
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For Summer has o'er-brimm'd their clamm
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Who hath not seen thee ot a!id thy st
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So!eti!es whoever see&s abroad !ay
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Thee sitting care"ess on a granary
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Thy hair sot$"ited by the winnowing wi
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r on a ha"$reap-d urrow sound as"eep
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Spares the ne/t swath and a"" its twin0d (
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And so!eti!es "i&e a g"eaner thou dos
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Steady thy "aden head across a br
! b d ith ti t l #
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!r by a cyder-press" with patient loo#
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Thou watchest the "ast oo%ings, hours by hours
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Where are the songs o Spring* Ay, where are they
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Thin& not o the!, thou hast thy !usic
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Whi"e barr0d c"ouds b"oo! the sot$dyi
A d t h th t bb" " i ith
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And touch the stubb"e$p"ains with rosy
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$ohn %ea
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4&o Autumn4 is a poe!by Eng"ish 5o!anticJohn Keats678 ctober 89:; < =7 >ebruary 8
http://en.wikipedia.org/wiki/Poetryhttp://en.wikipedia.org/wiki/Romanticismhttp://en.wikipedia.org/wiki/John_Keatshttp://en.wikipedia.org/wiki/John_Keatshttp://en.wikipedia.org/wiki/Romanticismhttp://en.wikipedia.org/wiki/Poetry -
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4To Autu!n4 is the +na" wor& in a go poe!s &nown as Keats#s 48?8: o
http://en.wikipedia.org/wiki/John_Keats's_1819_odeshttp://en.wikipedia.org/wiki/John_Keats's_1819_odes -
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4To Autu!n4 is a poe! o three stan%as, each o e"even "ines2 W8?8:, the structure is that o an oda"hy!n, having three c"earsections corresponding to the C"assica" divisions o strophe, anand epode
http://en.wikipedia.org/wiki/Ode#English_odehttp://en.wikipedia.org/wiki/Ode#English_odehttp://en.wikipedia.org/wiki/Strophehttp://en.wikipedia.org/wiki/Antistrophehttp://en.wikipedia.org/wiki/Epodehttp://en.wikipedia.org/wiki/Epodehttp://en.wikipedia.org/wiki/Antistrophehttp://en.wikipedia.org/wiki/Strophehttp://en.wikipedia.org/wiki/Ode#English_odehttp://en.wikipedia.org/wiki/Ode#English_ode -
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The i!agery is rich"yachieved through thepersoni+cationo Autu
http://en.wikipedia.org/wiki/Personificationhttp://en.wikipedia.org/wiki/Personification -
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oem
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Season o !ists and !e""ow ruitu"
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Close bosom-friend of the maturing sun
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Conspiring with him how to load and ble
With fruit the vines that round the thatch eves
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With fruit the vines that round the thatch-eves
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To bend with app"es the !oss#d cottage
A d ll ll f it ith i t th
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And ll all fruit with ripeness to the cor
o swe e gour an
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o swe e gour , anp"u!p the ha%e" she"
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With a sweet &erne"' to set budding !o
d i"" " ( h b
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And sti"" !ore, "ater (owers or the bee
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Wh h th t th t id th t
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Who hath not seen thee ot a!id thy st
So!eti!es whoever see&s abroad !ay
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So!eti!es whoever see&s abroad !ay
Thee sitting care"ess on
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Thee sitting care"ess on granary (oor,
Thy hair sot "ited by the winnowing wi
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Thy hair sot$"ited by the winnowing wi
r on a ha" reap-d urrow sound as"eep
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r on a ha"$reap d urrow sound as"eep
.rowsed with the u!e o poppies whi"e thy hoo&
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.rowsed with the u!e o poppies, whi"e thy hoo&
Agenda
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Agenda
ost"y this1
Agenda
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Agenda
And this1
Agenda
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Agenda
And this1
About your spea&er
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About your spea&erBCbar
uchgithub2co!DCbaruch
"in&d2inDbaruch
tac&over(ow2co!DusersDF=F;7Dba
What >rog*
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What >rog*
What >rog*
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What >rog*
What >rog*
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What >rog*
What >rog*
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What >rog*
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CONCURRENT DOWNLOADS
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CONCURRENT DOWNLOADS
Y U NO SUPPORT THEM?!
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>irst Association or concurrent down
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uc&y day1 .own"oad !anager written i
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y y g
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ONE DOES NOT SIMPLY
EMBED JDM
et-s "oo& i we can use
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et s "oo& i we can use
82Lo traceab"e "icense=2Lo website or docs
72Lo traceab"e sources
2Mt-s an app, not a "ib
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IF YOU WANT CONCURRENT DOWN
WRITE IT YOURSELF
WHY WONT YOU JUST
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WHY WON T YOU JUST
USE URLCONNECTION?
Java2net2ur"connectio
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J
82 e!ory wasteu" 6buNering
=2 ini!a" APM
72 O"oc&ing strea!s
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What we-re "oo&ing o
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g
82 AsyncDnon$b"oc&ing
=2 Event ca""bac&s
What is MT going to ta&
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g g
82 5eactor
=2 nio
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< pattern or "ightweight concu
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< Event driven
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g p
http1DDwww2dre2vanderbi"t2eduDsch!idtDP.>Dreactor$
i d
Quess the author by the diagr
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htt DD d D
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In Java, Reactor
means NIO
Se"ector as a !u"tip"e/
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Java version $ 5egister
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SocketChannel channel= SocketChannel.open
socketChannel.connect(new
InetSocketAddress("http://remote.com"
...
Selector selector = Selector.open();
channel.configureBlocking(false);SelectionKey k= channel.register(selecto
SelectionKey.OP_READ);
k.attach(handler);
Java version $ .ispatch
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while (!Thread.interrupted()) {
selector.select();
Set selected = selector.selectedKeys();
Iterator it = selected.iterator();
while (it.hasNext())
SelectionKey k= (SelectionKey)(it.ne ((Runnable)(k.attachment())).run();
selected.clear();
}
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HTTP NIO FRAMWORKS
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DO THE HEAVY LIFTING
Lio "ibraries
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< ost o the! are servers
< Letty, gri%%"y, etc2
< Apache ina
< Apache HTTP co!ponentsasyncc"ient
< Ling http c"ient
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< C"ient and server nio "ibrary< Evo"ved ro! netty
< atest re"ease ctober =F8=
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Lio "ibraries
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< ost o the! are servers
< Letty, gri%%"y, etc
< Apache ina
< Apache HTTP co!ponentsasyncc"ient
< Ling http c"ient
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Ling-s async http c"ie
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Here it is
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try 6AsyncHttpC"ient asyncHttpC"ient R new AsyncHttpC"ient6@@ istenab"e>uture5esponseU uture R asyncHttpC"ient2prepare (http)**oss+frogorg*api*system*ping(@2e/ecute6
A C " ti H d" 5 6@
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new AsyncCo!p"etionHand"er5esponseU6@ Bverride public 5esponse onCo!p"eted65esponse response@
Syste!2out2print"n6response2get5esponseOody6@@' return response' V
Bverride public void onThrowab"e6Throwab"e t@
t2printStac&Trace6@' V V@' 5esponse response R uture2get6@'V
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try (CloseableHttpAsyncClient asyncHttpClient = HttpAsyncClients.createDefau
asyncHttpClient.start();Future future = asyncHttpClient.execute(
HttpAsyncMethods.
createet("http://oss.jfrog.org/api/system/pingnew AsyncByteConsumer() {
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"#$errideprotected void onResponseRecei$ed(final HttpResponse respons
%yste&.out.println(response.'et%tatusine().'etReasonhr
*
"#$errideprotected voidonByteReceived(final Char+u,,er bu,! final -#
"#$errideprotected void releaseResources() { *
"#$errideprotected HttpResponse buildResult(final HttpContext context
return (HttpResponse) context.'etAttribute("http.respons*
*! null);HttpResponse response = future.get();
*
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Choosing between ning and http asyn
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4A"" prob"e!s in co!puter scienc
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p pcan be so"ved by another "eve" o
indirection4.avidWhee"er
pulic interface " ttp#rovider$ ow nload" andler{
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p p {
void onResponseRecei$ed(int statusCode! M ap< %trin'! ist< %trin'
oolean on+ytesRecei$ed(+yte+u,,er bu,);
void onFailed(/hro0 able error);
void onCanceled();
void onCo& pleted();*
Head to head
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Feature*,ibrary ing client .ttp Async Cl
/aturity Qood ery new 6ear"y0ownloadcancelation
Easy With bugs
rogress hoo#s Events notgranu"ar enough
Just use on+yteR
0ocumentation A bit sparse ini!a"
Server-sidecounterpart
Lone, c"ient on"y org2apache2httshttpcore$nio
Peror!ance*
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S!a"" +"e ediu! +"e arge +"eF
8FF=FF
7FF
FF
;FF
XFF
9FF?FF
:FF
http1DDb"ogs2at"assian2co!D=F87DF9Dhtt
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5c=X8X1 a universe o
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Conused*
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Just read so!e stac&over(ow6and i!prove your rep as you go@
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And that odiscoverinrange heal
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lost on re
HTTP WAR STORIES
uestion
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What shou"dcontent$"engwhen using
co!pression
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https1DDgithub2co!Dhttp=Dhttp=$specDissuesDX
uestion
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Why when redirected to C.Lthe chun&s start ro! %ero*
HttpAsyncClient+uilder builder = HttpAsyncClients.custo& ();11 add redirect strate'y that copies 2ran'e2 headers! i, existuilder.setRedirect%trategy(ne0 $ efaultRedirect%trategy(){
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uilder.setRedirect%trategy(ne0 $ efaultRedirect%trategy(){" #$erridepublic Http3riRe4uest 'etRedirect(HttpRe4uest re4uest! HttpResponse res
HttpContext context)Http3riRe4uest redirectRe4uest = super.'etRedirect(re4uest! response! co11 copy 2Ran'e2 headers! i, existHeader56 ran'eHeaders = re4uest.'etHeaders(HttpH eaders.RA78);
i, (ran'eHeaders 9= null) {,or (Header header : ran'eH eaders) {
redirectRe&uest.add" eader(header);
**return redirectRe4uest;
**);
uestion
i "
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How !any si!u"taneouconnections shou"d Mopen*
HTTP 1.1 GOES LIKE:
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CAN YOU PLEASE LIMIT
TO CONNECTIONS?
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BROWSERS GO LIKE:
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URL ENCODING?
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uestion
What-s
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What s
wrong withe o""ow
code*
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public static String
encode)r"6String ur"Str@ )5Encoder2encode6ur"Str, (1&2(@'
222V
.ecoded )5s cannot bere$encoded to the sa!e or!
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http:11exa& ple.co& 14uery= ab= = c
Cannot be decoded bac a,ter it 0 as e
http:11exa& ple.co& 14uery= a ?@b= =
.on-t useava2net2)5Encoder)ti"it " HT di
http://example.com/?query=a&b==chttp://example.com/?query=a&b==chttp://example.com/?query=a&b==chttp://example.com/?query=a&b==chttp://example.com/?query=a&b==chttp://example.com/?query=a&b==c -
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)ti"ity c"ass or HT or! encoding2
c"ass contains static !ethods orconverting a String to the applicatiowww-form-urlencoded ME or!at2
>or !ore inor!ation about HT or!
encoding, consu"t the HT speci+cat
AHC A"ternatives
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or'.apache.http.client.utils.3R-+uilder
or'.apache.http.client.utils.3R8ncoded3til
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< Write to separate +"es, co!b+nish
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< Write to sa!e +"e, see&ing t
right position
WHY WONT YOU JUST US
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JAVA.IO.RANDOMACCESSFILE
eve" >i"e oc&ingWHY DO YOU NEED LOCKS
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IF YOU WRITE TO
DIFFERENT PARTS OF FILE?
eve" >i"e oc&ing< Prevent sa!e threads writing t
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Prevent sa!e threads writing t
+"e when we started c"osing it< C"osing seGuence1
< 5e"ease +"e "oc&s
< C"ose channe"s< 5ena!e a +"e to it#s +na" na!e 6re!o
< Erase progress ino
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What-s ne/t*
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httpD=< ost"y standardi%ing Qoog"e#s spd
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y g g p
< Header co!pression< !u"tip"e/ing
< Prioriti%ation
< Server push< n the way c"ear so!e stuN
< E2g2 co!pressed content "ength
How is this useu" to !
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i&e r2 organ said, the abi"ity to !a&e st"ogica" argu!ents wi"" beco!e !ore and !i!portant "ater on in high schoo" and co""e
Pathos and ethos are sti"" va"uab"e Out you
audience wi"" be a "ot better at Guestioningogos is handy because, i you use it we"", rea""y be disproved2
How is this useu" to !Out even better is the superpower to spot weak "
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Out even better is the superpower to spot weak"
Le/t ti!e you watch T or go on"ine 6with your pper!ission, o course@, try to &eep trac& o how !diNerent argu!ents are being pitched to you by !uch ino is given to you* How !uch is "et out*
What ti!e is it*Adven$ wait no Activity ti!e
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Adven$ wait, no2 Activity ti!e
Pair oN into groups o our2 Each group wi"" receive ano a poor argu!ent 6these !ay be either inductive or
With your group, you wi"" have ; !inutes to try to co!one countere3ample$ one way in which the argu!cou"d be wrong, even i the pre!ises are de+nite"y tr
Po&e it u"" o ho"esA"so, choose a group representative to te"" us your re
6Mt#s K to i!agine un"i&e"y or weird e/p"anations'don#t be araid to thin& outside the bo/2
So!e e/a!p"es1ARGUMENT: M pu""ed an a""$nighter studying or "ast we
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ARGUMENT: M pu""ed an a""$nighter studying or "ast wetest, and M ended up with an A2 Tiredness !ust !a&e !
COUNTER:What i you got an A because you actua""y sr !aybe the test was going to be easy or you a"" a"on
ARGUMENT:M M p"ay with .ad#s power too"s, he#"" ye""
Out .ad isye""ing at !e or so!ething2 So M guess M !p"ayed with the power too"s2I
COUNTER:What i he#s ye""ing at you or a diNerent rescratching the car, or ha!!er$throwing the cat onto t
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$ohn %ea
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4&o Autumn4 is a poe!by Eng"ish 5o!anticJohn Keats678 ctober 89:; < =7 >ebruary 8
http://en.wikipedia.org/wiki/Poetryhttp://en.wikipedia.org/wiki/Romanticismhttp://en.wikipedia.org/wiki/John_Keatshttp://en.wikipedia.org/wiki/John_Keatshttp://en.wikipedia.org/wiki/Romanticismhttp://en.wikipedia.org/wiki/Poetry -
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4To Autu!n4 is the +na" wor& in a gro poe!s &nown as Keats#s 48?8: o
4To Autu!n4 is a poe! o three stan%as each o e"even "ines W
http://en.wikipedia.org/wiki/John_Keats's_1819_odeshttp://en.wikipedia.org/wiki/John_Keats's_1819_odes -
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To Autu!n is a poe! o three stan%as, each o e"even "ines2 W8?8:, the structure is that o an oda"hy!n, having three c"earsections corresponding to the C"assica" divisions o strophe, anand epode
Th i i i h" hi d
http://en.wikipedia.org/wiki/Ode#English_odehttp://en.wikipedia.org/wiki/Ode#English_odehttp://en.wikipedia.org/wiki/Strophehttp://en.wikipedia.org/wiki/Antistrophehttp://en.wikipedia.org/wiki/Epodehttp://en.wikipedia.org/wiki/Epodehttp://en.wikipedia.org/wiki/Antistrophehttp://en.wikipedia.org/wiki/Strophehttp://en.wikipedia.org/wiki/Ode#English_odehttp://en.wikipedia.org/wiki/Ode#English_ode -
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The i!agery is rich"y achievedthrough the personi+cationo Au
http://en.wikipedia.org/wiki/Personificationhttp://en.wikipedia.org/wiki/Personification -
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oem
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Close bosom-friend of the maturing su
Conspiring with him how to load and
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To bend with app"es the !oss#d cottage$tre
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And ll all fruit with ripeness to the
core;
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To swe"" the gourd, and p"u!p the ha%e"
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With a sweet &erne"' to set budding
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And sti"" !ore, "ater (owers or the
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)nti" they thin& war! days wi"" never cea
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For Summer has o'er-brimm'd their clamm
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Who hath not seen thee ot a!id thy st
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So!eti!es whoever see&s abroad +nd
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Thee sitting care"ess on a granary
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Thy hair sot$"ited by the winnowin
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r on a ha"$reap-d urrow sound as
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.rowsed with the u!e o poppies, whi"e thy h
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Spares the ne/t swath and a"" its twin0d(owers1
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And so!eti!es "i&e a g"eaner thou dost
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Steady thy "aden head across a br
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8/9/2019 Gary Sobers
160/174
!r by a cyder-press" with patient
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8/9/2019 Gary Sobers
161/174
Thou watchest the "ast oo%ings, hours by
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8/9/2019 Gary Sobers
162/174
Where are the songs o Spring* Ay, where are
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8/9/2019 Gary Sobers
163/174
Thin& not o the!, thou hast thy !usic t
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8/9/2019 Gary Sobers
164/174
Whi"e barr0d c"ouds b"oo! the sot$dying
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8/9/2019 Gary Sobers
165/174
And touch the stubb"e$p"ains with rosy
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8/9/2019 Gary Sobers
166/174
Then in a wai"u" choir the s!a"" gnats !
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8/9/2019 Gary Sobers
167/174
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8/9/2019 Gary Sobers
168/174
r sin#ing as the light wind live
ies;sin&ing
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8/9/2019 Gary Sobers
169/174
And u""$grown "a!bs "oud b"eat ro! hi""y b
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8/9/2019 Gary Sobers
170/174
edge$cric&ets sing' and now with treb
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8/9/2019 Gary Sobers
171/174
The redbreast whist"es ro! a garde
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8/9/2019 Gary Sobers
172/174
And gathering swa""ows twitter in th
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8/9/2019 Gary Sobers
173/174
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8/9/2019 Gary Sobers
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